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 * The MIT License (MIT)                                                         *
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 * Copyright (c) 2015-2023 aoju.org and other contributors.                      *
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package org.aoju.bus.core.lang.ansi;

/**
 * 生成ANSI格式的编码输出
 *
 * @author Kimi Liu
 * @since Java 17+
 */
public abstract class AnsiEncoder {

    private static final String ENCODE_JOIN = ";";
    private static final String ENCODE_START = "\033[";
    private static final String ENCODE_END = "m";
    private static final String RESET = "0;" + Ansi4BitColor.DEFAULT;

    /**
     * 创建ANSI字符串，参数中的{@link AnsiElement}会被转换为编码形式。
     *
     * @param args 节点数组
     * @return ANSI字符串
     */
    public static String encode(final Object... args) {
        final StringBuilder sb = new StringBuilder();
        buildEnabled(sb, args);
        return sb.toString();
    }

    /**
     * 追加需要需转义的节点
     *
     * @param sb   {@link StringBuilder}
     * @param args 节点列表
     */
    private static void buildEnabled(final StringBuilder sb, final Object[] args) {
        boolean writingAnsi = false;
        boolean containsEncoding = false;
        for (final Object element : args) {
            if (null == element) {
                continue;
            }
            if (element instanceof AnsiElement) {
                containsEncoding = true;
                if (writingAnsi) {
                    sb.append(ENCODE_JOIN);
                } else {
                    sb.append(ENCODE_START);
                    writingAnsi = true;
                }
            } else {
                if (writingAnsi) {
                    sb.append(ENCODE_END);
                    writingAnsi = false;
                }
            }
            sb.append(element);
        }

        // 恢复默认
        if (containsEncoding) {
            sb.append(writingAnsi ? ENCODE_JOIN : ENCODE_START);
            sb.append(RESET);
            sb.append(ENCODE_END);
        }
    }

}
